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factor some code better.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90299 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-12-02 06:44:58 +00:00
parent 65a9ab4f8f
commit 720e790480
1 changed files with 10 additions and 10 deletions
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20
lib/Transforms/Scalar/GVN.cpp
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@ -1187,6 +1187,13 @@ static Value *ConstructSSAForLoadSet(LoadInst *LI,
return V;
}
static bool isLifetimeStartOrEnd(Instruction *Inst) {
if (IntrinsicInst* II = dyn_cast<IntrinsicInst>(Inst))
return II->getIntrinsicID() == Intrinsic::lifetime_start ||
II->getIntrinsicID() == Intrinsic::lifetime_end;
return false;
}
/// processNonLocalLoad - Attempt to eliminate a load whose dependencies are
/// non-local by performing PHI construction.
bool GVN::processNonLocalLoad(LoadInst *LI,
@ -1254,21 +1261,14 @@ bool GVN::processNonLocalLoad(LoadInst *LI,
Instruction *DepInst = DepInfo.getInst();
// Loading the allocation -> undef.
if (isa<AllocaInst>(DepInst) || isMalloc(DepInst)) {
if (isa<AllocaInst>(DepInst) || isMalloc(DepInst) ||
// Loading immediately after lifetime begin or end -> undef.
isLifetimeStartOrEnd(DepInst)) {
ValuesPerBlock.push_back(AvailableValueInBlock::get(DepBB,
UndefValue::get(LI->getType())));
continue;
}
// Loading immediately after lifetime begin or end -> undef.
if (IntrinsicInst* II = dyn_cast<IntrinsicInst>(DepInst)) {
if (II->getIntrinsicID() == Intrinsic::lifetime_start ||
II->getIntrinsicID() == Intrinsic::lifetime_end) {
ValuesPerBlock.push_back(AvailableValueInBlock::get(DepBB,
UndefValue::get(LI->getType())));
}
}
if (StoreInst *S = dyn_cast<StoreInst>(DepInst)) {
// Reject loads and stores that are to the same address but are of
// different types if we have to.